| qubi,
they have a membrane on the rear, and there is a gap between them and the wall.
i considered a membrane on the front, but my initial aim was to do something against mid frequencies between 300 and 700 cycles. so i didn't put a membrane on the front, since i didn't want the surface to be reflective at all.
in case i get the feeling that i have to do something in the bass frequencies as well, i know someone who can construct helmholtz resonators for me. but in the moment it looks like i don't need them. |